Nissan has a few oils blended for them. It's just like how Pennzoil has their standard blend, a full synthetic blend, a long life blend, etc. Nissan happens to have their standard oils, then the Z-specific Ester blend. If your location limits you to only Nissan's standard 5W40 or Mobil 1 0W40, whichever one you pick is irrelevant. You will likely never see snow, although I don't doubt you will see colder temperatures. As a result, since your winter weights are mostly irrelevant, so go with whichever you prefer.

I would personally select Mobil 1 because it is considered to be a highly synthetic or fully synthetic oil. If I had any idea what Nissan used for their oil then I would actually have more of a choice to make.

If you really can't pick, just go with whatever the dealer gives you. Either way is good.

So it is a fact that although the oil 5w40 here is made by Nissan it has no esters? Only the 5w30 does? There is nothing on the bottle to tell me if there are esters?

It is likely that it has esters, but not enough to call it an ester oil. It is just as likely that it might have no esters at all. The viscosity of the oil doesn't have anything to do with what is in the oil.

Only the Nissan ESTER OIL has enough esters to be called an ester oil. This oil is made only for the Z and comes only in a single viscosity.

:facepalm:

A single viscosity oil would be for example a 30 where it stays that weight. A multiple viscosity oil is a 5w30 where the weight changes due to temperature.

Nissan Ester oil only has a small percentage of ester base in it where brands like Red Line is all pure Ester oil.

A single "viscosity" i.e. only comes in 5W30, not a single weight oil.

Oil threads are so much fun. I don't even remember what the original question was.

Does Mobil 1 0w40 have esters?

Good read

Motoiq.com "revenge of the nerd - Nissan in the sump with diamonds"

Why are you so hung up on esters? Your Z will run fine with or without esters in the oil.

The price will tell you. Easily.

this guy just doesn't get it. I know im hard headed and some of you who have talked to me in other threads have but GOD DAMN!!! Stop asking others and do the damn research yourself.

Hey Roy,

Thanks for the two cents. Been there done that. Thread is finished. Got all I need. Next time pipe in a little earlier. Thanks